Measurement of magnetic field characteristics of wigglers with the current strained wire method

Bekhtenev, E. A.; Dementiev, E. N.; Fedurin, M.; Mezentsev, N. A.; Shkaruba, V. A.; Vobly, P.D.

doi:10.1016/s0168-9002(97)01053-x

Cited by 10 publications

(4 citation statements)

References 8 publications

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“…These last ones are mechanically supported and their motion controlled by the set of linear translation stages installed on the precise long bench. This concept was introduced by the BINP SC wiggler team [145] and has been adopted for the APS's SCU magnetic measurements. The set up utilizes the same types of magnetic sensors, such as Hall probes, rotating coils, etc., as the ones used for the magnetic characterization of out-of-vacuum permanent magnet undulators.…”

Section: Magnetic Measurementsmentioning

confidence: 99%

Cryogenic permanent magnet and superconducting undulators

Bahrdt

Gluskin

2018

Nuclear Instruments and Methods in Physics Research Section A:

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Section: Magnetic Measurementsmentioning

confidence: 99%

Cryogenic permanent magnet and superconducting undulators

Bahrdt

Gluskin

2018

Nuclear Instruments and Methods in Physics Research Section A:

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“…The concept of vibrating wire was introduced by Temnykh in 1997 [173]: when the wire is fed with an alternating current close to the wire's natural frequency, the wire will excite a unique harmonic in the presence of a magnetic field; by measuring a large number of harmonics, the on-axis undulator field can be reconstructed precisely. The stretched wire with direct current method was introduced for the measurement of BINP SCWs [174]. This method has poor measurement accuracy but with fast measurement speed, allowing for monitoring the field integrals during ramping the current or a quench.…”

Section: Pulsed Wire Methodmentioning

confidence: 99%

Review and prospects of world-wide superconducting undulator development for synchrotrons and FELs

Zhang

Calvi²

2022

Supercond. Sci. Technol.

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Superconducting undulators (SCUs) with period >15 mm can offer much higher on-axis undulator field B0 than state-of-the-art cryogenic permanent magnet undulators (CPMUs) with the same period and vacuum gap. The commissioned NbTi planar SCUs for user operation in the Karlsruhe Institute of Technology (KIT) synchrotron and the Advanced Photon Source (APS) storage ring are operated stably without quenches, producing outperformed photon flux in the high energy part of the hard X-ray spectrum. Another potential advantage of deploying SCU is its radiation hardness, a crucial characteristic for being used in free electron lasers (FELs) driven by high repetition rate superconducting linear accelerators (LINACs) and diffraction limited storage rings (DLSRs) with small vacuum gap and large averaged beam current. Development of shorter period but high field SCU is an important mission in an EU founded CompactLight project as this technology would reduce both the length of undulators and the length of LINACs. This review paper first overviews the research and development of SCUs worldwide from late 1970s to 2021, then presents the SCU design requirements and compares the theory limits of different types of planar and helical SCUs, and finally reviews the technical challenges including the SCU cryostat, the magnetic field measurement, the integral/local field correction and the high-temperature superconductor (HTS) challenges and prospects the research needs for SCUs.

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“…The stretched wire with direct current, introduced for the superconducting wigglers developed at BINP [33,34], uses the principle that a stretched wire with a DC I in a stationary magnetic field is moved. By measuring the vertical and horizontal change in position of the wire at the beginning and the end of the magnetic region (in figure 7 at z=d 1 and z=d 1 +d 2 +L), by for example two-coordinate laser micrometers, allows the measurement of the vertical and horizontal first and second field integrals simultaneously.…”

Section: Integral Field Measurementsmentioning

confidence: 99%

“…Both CuBe [33] and niobium titanium (NbTi) [34] wires have been used. The accuracy achieved of » -I 10 1 4 Tm and I 2 ≈10 −4 Tm 2 is not as good as what can be obtained with the moving wire method (see section 5.2).…”

Section: Integral Field Measurementsmentioning

confidence: 99%

A review of magnetic field measurements of full scale conduction cooled superconducting undulator coils

Casalbuoni¹

2018

Supercond. Sci. Technol.

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Synchrotron light sources employ undulators to produce brilliant photon beams. Most synchrotrons and all free electron lasers use undulators made by permanent magnets. Superconducting undulators can produce, for the same geometry, a higher peak magnetic field on axis with respect to permanent magnet ones, and have the additional advantage of being radiation hard. Recently superconducting undulators have been successfully applied in the Karlsruhe Institute of Technology synchrotron and in the Advanced Photon Source at the Argonne National Laboratory. While precise measurement techniques to characterize the magnetic field for permanent magnet undulators are well established, new developments have been necessary in the past few years to magnetically characterize superconducting undulators. After an introduction on undulators and the measurements needed to be performed before operating such devices with electron beams, this paper reviews magnetic field measurements of full scale conduction cooled superconducting undulator coils. Current and future methods used for the characterization of the magnetic field, after installation of such coils in the final cryostat, are also discussed.

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Measurement of magnetic field characteristics of wigglers with the current strained wire method

Cited by 10 publications

References 8 publications

Cryogenic permanent magnet and superconducting undulators

Cryogenic permanent magnet and superconducting undulators

Review and prospects of world-wide superconducting undulator development for synchrotrons and FELs

A review of magnetic field measurements of full scale conduction cooled superconducting undulator coils

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